One of the biggest disappointment with the Zeiss is not able to use the ZM wide angle series on the full frame Sony Alpha series of bodies. Even the ZM 35mm f2 Biogon has some corner issues. Although the corner colour cast has disappeared on the Alpha 7R2, to me the images at the corners are still not usable. So it is sad that the made in Germany ZM 15/2.8 Distagon can only be used on A7 in the APS-C mode, and the ZF 15/2.8 Distagon will perform well as the rear element is far away enough from the A7 sensor.

15mm focal length is not easy to compose, and the size of the lens is also quite bulky, and if weight and camera bag space is a constraint then I would prefer the much more handy Loxia 21/2.8. But the ZF 15/2.8 being a Distagon design caters for camera body with reflex mirror, the light falls off at smaller aperture performance is very good.

Alpha 7R, f5.6 1/15, ISO 125, Manfrotto 190B/054Mg, 17 Dec 2015.

This lens has very good sharpness and very resistance to flare. For photographers who like to work with 15mm this is a good candidate to consider. A lens that can be used with confident at all shooting conditions.